# Relationship history for MSHA mine 2901891

Current hierarchy: **Stowe John D & Henry B Ellis → Valley Transit Mix → Organ Quarry**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Stowe John D & Henry B Ellis → Organ Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Gilbert Western Corp → Organ Quarry; 1982-11-01 to 1988-10-18; source msha-controller-operator-history
- **controller_controls_mine:** Peter Kiewit Sons' Inc → Organ Quarry; 1982-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Peter Kiewit Sons' Inc → Gilbert Western Corp; 1982-11-01 to 1988-10-18; source msha-controller-operator-history
- **operator_operates_mine:** Valley Transit Mix → Organ Quarry; 1988-10-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Stowe John D & Henry B Ellis → Valley Transit Mix; 1988-10-19 to current/open; source msha-controller-operator-history